After microstructure examination and hardness test, write a laboratory report of the experiment and discuss your results

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After Microstructure Examination And Hardness Test Write A Laboratory Report Of The Experiment And Discuss Your Results 1 (74.82 KiB) Viewed 68 times

After microstructure examination and hardness test, write a laboratory report of the experiment and discuss your results. POST LAB QUESTIONS 1. Briefly (not more than two sentences each) describe the steps involved in the preparation of a metallographic sample: Sectioning Mounting Course Grinding Fine Grinding Polishing Etching 2. Why must metallographic samples be washed and carefully dried before proceeding from one grinding or polishing operation to the next? 3. What is the purpose of etching metallographic samples? 4. Explain why metallographic samples are sometimes mounted in plastic? 5. Briefly explain the effect of grain size on the strength of a metal. 6. How should a Rockwell hardness reading of 63 be expressed if tested with the C scale? 7. Would you expect a deep hardness indentation to result in a high hardness number? Explain. Why isn't the diamond Brale indenter used on copper alloys? errors 8. If 10 hardness tests were to be conducted on the same specimen, why would large erre result if the measurements were all made at the same point? 9. What is "Superficial Rockwell Hardness Testing" and when should it be used? 10. Determine the Tensile Strength of a steel sample with a Rockwell C reading of 63.